Joining up with Bill Gates, George Lucas, Warren Buffett, and 50 other billionaires, Zuckerberg has agreed to donate the majority of his wealth to charity, as part of the Giving Pledge movement Gates launched back in August.

Our favorite charity-worker Bill Gates has successfully signed up 38 billionaires to give away half …
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It's the largest philanthropic work ever done, with over 50 billionaires pledging to give away most of their fortunes to various charities. They're not legally bound to do so, but if they renege then I imagine all hell would break loose. Just imagine having Gates' beady glare on you, wherever you go. *shudder*

15 other billionaires signed up recently, alongside Zuckerberg. AOL's co-founder Steve Case, and investor Carl Icahn are just some of the names you might recognize. The charities on the receiving end of the Giving Pledge's handout haven't been named yet, but considering Gates fascination with green issues, I wouldn't be surprised if we saw some funky eco-friendly initiatives start looking...well, greener. [WSJ]